Lewis a



(No Model.)

L. A. W'EYBURN.

BARRON r N0..35Z,383. I Patented NOV. 9, 1886.

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NITED STATES PATENT Erica.

LEWIS A. WEYBURN, OF ROCKFORD, ILLINOIS, ASSIGNOR TO THE L. A.

' WEYBURN COMPANY, OF SAME PLACE.

HARROW.

SPECIFICATION forming part of Letters Patent No. 352,383, dated November9, 1886.

' Application filed July 3, 1886. Serial No. 207,097.

To aZZ whom it 71mg concern:

Be it known that 1, LEWIS A. WEYBURN, a citizen of the United States,residing in the city of Rockford, in the county of Winnebago and Stateof Illinois, have invented a new and useful Improvement in Harrows, ofwhich the following is a specification.

This invention relates to the teeth employed in barrows. Its object isto divide'and pulverize the soil. l

It consists in the construction represented in the accompanyingdrawings, to be hereinafter described, and in which Figure l is anisometrical representation of a tooth embodying myinvention, and Fig. 2is a transverse section on dotted line a on Fig. 1.

The barrow-tooth represented in the accompanying drawings is providedwith a shank, 1, to engage a beam of the harrow to fix it in place. Thisshank l in this instance is of taper form and-cylindrical in transversesection, and its end portion is screw-threaded and provided with ascrewnut, '2, to clamp and hold itin place in the beam. The tooth3depends from its cylindrical shank portion, and is curved rearwardsubstantially in the segment of a circle, and its extreme rear ngportion, 4, is twisted to nearly a horizontal position and is on y eddowgward. The vertical and rearwardcurving portion 3 of the tooth,between its shank and its rear end-twisted portions,is produced inknife-edge form on its forward convex edge, 5, as shown in section inFig. 2.

My improved harrow-tooth is designed for use inharrows of the usualconstruction, and instead of the taper cylindrical shank 1 employed toconnect it to the beam, any other known form of attachment capable ofuse in connection with my improved tooth may be employed. 4

(No model.)

The use of my improved tooth: In the forward movement of the harrow theknife-edge of the tooth will readily divide the earth, and its twistedrearend will lift and pulverize the ground.

I am aware that previous to my invention it has been proposed toprovidea harrow-tooth one end of. which was a threaded shank, to securesaid tooth to a beam, the remaining portion of the tooth curvingdownward and rear: wardly, at which end the upper and lower corners werebent laterally to a slight extent to form a deflecting portion. I amalso aware that it has been proposed to provide a harrow-tooth havingits front portion bent horizontally to furnish a fastening portion, theremainder of said tooth depending rearwardly, and having its extremitybent or twisted laterally to a slight extent. In the first constructionthe ends of the tooth deflect the earth to one side, and in the othercase thetwisted portion lies below the effective portion of thecutting-edge. In my improved construction the curved cutting-edgeapproximates a semicircle, so that the rear twisted portion lies inahigher plane,

thus insuring the cutting portion entering deep

